pH utawa derajat keasaman iku minangka level keasaman mulai saka pH 0 sing paling asem tekan pH 14 kang paling basa. Rumus sing nemtokake nilai pH yaiku:
p H = − log 10 ( a H + ) {\displaystyle pH=-\log _{10}(a_{H+})}
endi aH+ minangka aktivitas ion hidrogen. Alat kanggo ngukur nilai pH diarani pH meter.
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